You can know, and be persuaded, in what you have believed!

 “… I know whom I have believed and am persuaded that He is able to keep what I have committed to Him until that Day.” (2 Tim. 1:12 NKJV)

You can be confident

“For I am confident of this very thing, that He who began a good work in you will perfect it until the day of Christ Jesus.” (Phil. 1:6 NASB)

“In him and through faith in him we may approach God with freedom and confidence.” (Eph. 3:13 NIV)

You can be steadfast

“Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord.” (2 Cor. 15:58 NASB)

And you can be sure of this...

“And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ.” (Phil. 1:6 ESV)